Stock Photo - Caselli's pantelegraph: At the sending station the dispatch was written or drawn on sheet of metallized paper in thick insulating ink and placed on curved plate. At receiving station, sheet of paper impregnated with potassium ferrocyanide placed in plate

Stock Photo: Caselli's pantelegraph: At the sending station the dispatch was written or drawn on sheet of metallized paper in thick insulating ink and placed on curved plate.

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